source4/auth/ntlmssp/ntlmssp_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, client server side parsing
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/network.h"
  26 #include "lib/tsocket/tsocket.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "../libcli/auth/libcli_auth.h"
  29 #include "../lib/crypto/crypto.h"
  30 #include "auth/gensec/gensec.h"
  31 #include "auth/auth.h"
  32 #include "param/param.h"
  33
  34 /**
  35  * Set a username on an NTLMSSP context - ensures it is talloc()ed
  36  *
  37  */
  38
  39 static NTSTATUS ntlmssp_set_username(struct ntlmssp_state *ntlmssp_state, const char *user)
  40 {
  41         if (!user) {
  42                 /* it should be at least "" */
  43                 DEBUG(1, ("NTLMSSP failed to set username - cannot accept NULL username\n"));
  44                 return NT_STATUS_INVALID_PARAMETER;
  45         }
  46         ntlmssp_state->user = talloc_strdup(ntlmssp_state, user);
  47         if (!ntlmssp_state->user) {
  48                 return NT_STATUS_NO_MEMORY;
  49         }
  50         return NT_STATUS_OK;
  51 }
  52
  53 /**
  54  * Set a domain on an NTLMSSP context - ensures it is talloc()ed
  55  *
  56  */
  57 static NTSTATUS ntlmssp_set_domain(struct ntlmssp_state *ntlmssp_state, const char *domain)
  58 {
  59         ntlmssp_state->domain = talloc_strdup(ntlmssp_state, domain);
  60         if (!ntlmssp_state->domain) {
  61                 return NT_STATUS_NO_MEMORY;
  62         }
  63         return NT_STATUS_OK;
  64 }
  65
  66 /**
  67  * Set a workstation on an NTLMSSP context - ensures it is talloc()ed
  68  *
  69  */
  70 static NTSTATUS ntlmssp_set_workstation(struct ntlmssp_state *ntlmssp_state, const char *workstation)
  71 {
  72         ntlmssp_state->workstation = talloc_strdup(ntlmssp_state, workstation);
  73         if (!ntlmssp_state->workstation) {
  74                 return NT_STATUS_NO_MEMORY;
  75         }
  76         return NT_STATUS_OK;
  77 }
  78
  79 /**
  80  * Determine correct target name flags for reply, given server role
  81  * and negotiated flags
  82  *
  83  * @param ntlmssp_state NTLMSSP State
  84  * @param neg_flags The flags from the packet
  85  * @param chal_flags The flags to be set in the reply packet
  86  * @return The 'target name' string.
  87  */
  88
  89 static const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
  90                                        uint32_t neg_flags, uint32_t *chal_flags)
  91 {
  92         if (neg_flags & NTLMSSP_REQUEST_TARGET) {
  93                 *chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
  94                 *chal_flags |= NTLMSSP_REQUEST_TARGET;
  95                 if (ntlmssp_state->server.is_standalone) {
  96                         *chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
  97                         return ntlmssp_state->server.netbios_name;
  98                 } else {
  99                         *chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
 100                         return ntlmssp_state->server.netbios_domain;
 101                 };
 102         } else {
 103                 return "";
 104         }
 105 }
 106
 107
 108
 109 /**
 110  * Next state function for the Negotiate packet
 111  *
 112  * @param gensec_security GENSEC state
 113  * @param out_mem_ctx Memory context for *out
 114  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 115  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 116  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
 117  */
 118
 119 NTSTATUS ntlmssp_server_negotiate(struct gensec_security *gensec_security,
 120                                   TALLOC_CTX *out_mem_ctx,
 121                                   const DATA_BLOB in, DATA_BLOB *out)
 122 {
 123         struct gensec_ntlmssp_context *gensec_ntlmssp =
 124                 talloc_get_type_abort(gensec_security->private_data,
 125                                       struct gensec_ntlmssp_context);
 126         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 127         DATA_BLOB struct_blob;
 128         uint32_t neg_flags = 0;
 129         uint32_t ntlmssp_command, chal_flags;
 130         uint8_t cryptkey[8];
 131         const char *target_name;
 132         NTSTATUS status;
 133
 134         /* parse the NTLMSSP packet */
 135 #if 0
 136         file_save("ntlmssp_negotiate.dat", request.data, request.length);
 137 #endif
 138
 139         if (in.length) {
 140                 if ((in.length < 16) || !msrpc_parse(out_mem_ctx,
 141                                                          &in, "Cdd",
 142                                                          "NTLMSSP",
 143                                                          &ntlmssp_command,
 144                                                          &neg_flags)) {
 145                         DEBUG(1, ("ntlmssp_server_negotiate: failed to parse "
 146                                 "NTLMSSP Negotiate of length %u:\n",
 147                                 (unsigned int)in.length ));
 148                         dump_data(2, in.data, in.length);
 149                         return NT_STATUS_INVALID_PARAMETER;
 150                 }
 151                 debug_ntlmssp_flags(neg_flags);
 152         }
 153
 154         ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
 155
 156         /* Ask our caller what challenge they would like in the packet */
 157         status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge: %s\n",
 160                           nt_errstr(status)));
 161                 return status;
 162         }
 163
 164         /* Check if we may set the challenge */
 165         if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
 166                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
 167         }
 168
 169         /* The flags we send back are not just the negotiated flags,
 170          * they are also 'what is in this packet'.  Therfore, we
 171          * operate on 'chal_flags' from here on
 172          */
 173
 174         chal_flags = ntlmssp_state->neg_flags;
 175
 176         /* get the right name to fill in as 'target' */
 177         target_name = ntlmssp_target_name(ntlmssp_state,
 178                                           neg_flags, &chal_flags);
 179         if (target_name == NULL)
 180                 return NT_STATUS_INVALID_PARAMETER;
 181
 182         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 183         ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
 184
 185         /* This creates the 'blob' of names that appears at the end of the packet */
 186         if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
 187                 msrpc_gen(out_mem_ctx,
 188                           &struct_blob, "aaaaa",
 189                           MsvAvNbDomainName, target_name,
 190                           MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
 191                           MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
 192                           MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
 193                           MsvAvEOL, "");
 194         } else {
 195                 struct_blob = data_blob(NULL, 0);
 196         }
 197
 198         {
 199                 /* Marshal the packet in the right format, be it unicode or ASCII */
 200                 const char *gen_string;
 201                 if (ntlmssp_state->unicode) {
 202                         gen_string = "CdUdbddB";
 203                 } else {
 204                         gen_string = "CdAdbddB";
 205                 }
 206
 207                 msrpc_gen(out_mem_ctx,
 208                           out, gen_string,
 209                           "NTLMSSP",
 210                           NTLMSSP_CHALLENGE,
 211                           target_name,
 212                           chal_flags,
 213                           cryptkey, 8,
 214                           0, 0,
 215                           struct_blob.data, struct_blob.length);
 216         }
 217
 218         ntlmssp_state->expected_state = NTLMSSP_AUTH;
 219
 220         return NT_STATUS_MORE_PROCESSING_REQUIRED;
 221 }
 222
 223 struct ntlmssp_server_auth_state {
 224         DATA_BLOB user_session_key;
 225         DATA_BLOB lm_session_key;
 226         /* internal variables used by KEY_EXCH (client-supplied user session key */
 227         DATA_BLOB encrypted_session_key;
 228 };
 229
 230 /**
 231  * Next state function for the Authenticate packet
 232  *
 233  * @param ntlmssp_state NTLMSSP State
 234  * @param request The request, as a DATA_BLOB
 235  * @return Errors or NT_STATUS_OK.
 236  */
 237
 238 static NTSTATUS ntlmssp_server_preauth(struct ntlmssp_state *ntlmssp_state,
 239                                        struct ntlmssp_server_auth_state *state,
 240                                        const DATA_BLOB request)
 241 {
 242         uint32_t ntlmssp_command, auth_flags;
 243         NTSTATUS nt_status;
 244
 245         uint8_t session_nonce_hash[16];
 246
 247         const char *parse_string;
 248         char *domain = NULL;
 249         char *user = NULL;
 250         char *workstation = NULL;
 251
 252 #if 0
 253         file_save("ntlmssp_auth.dat", request.data, request.length);
 254 #endif
 255
 256         if (ntlmssp_state->unicode) {
 257                 parse_string = "CdBBUUUBd";
 258         } else {
 259                 parse_string = "CdBBAAABd";
 260         }
 261
 262         /* zero these out */
 263         data_blob_free(&ntlmssp_state->session_key);
 264         data_blob_free(&ntlmssp_state->lm_resp);
 265         data_blob_free(&ntlmssp_state->nt_resp);
 266
 267         ntlmssp_state->user = NULL;
 268         ntlmssp_state->domain = NULL;
 269         ntlmssp_state->workstation = NULL;
 270
 271         /* now the NTLMSSP encoded auth hashes */
 272         if (!msrpc_parse(ntlmssp_state,
 273                          &request, parse_string,
 274                          "NTLMSSP",
 275                          &ntlmssp_command,
 276                          &ntlmssp_state->lm_resp,
 277                          &ntlmssp_state->nt_resp,
 278                          &domain,
 279                          &user,
 280                          &workstation,
 281                          &state->encrypted_session_key,
 282                          &auth_flags)) {
 283                 DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
 284                 dump_data(10, request.data, request.length);
 285
 286                 /* zero this out */
 287                 data_blob_free(&state->encrypted_session_key);
 288                 auth_flags = 0;
 289
 290                 /* Try again with a shorter string (Win9X truncates this packet) */
 291                 if (ntlmssp_state->unicode) {
 292                         parse_string = "CdBBUUU";
 293                 } else {
 294                         parse_string = "CdBBAAA";
 295                 }
 296
 297                 /* now the NTLMSSP encoded auth hashes */
 298                 if (!msrpc_parse(ntlmssp_state,
 299                                  &request, parse_string,
 300                                  "NTLMSSP",
 301                                  &ntlmssp_command,
 302                                  &ntlmssp_state->lm_resp,
 303                                  &ntlmssp_state->nt_resp,
 304                                  &domain,
 305                                  &user,
 306                                  &workstation)) {
 307                         DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP:\n"));
 308                         dump_data(2, request.data, request.length);
 309
 310                         return NT_STATUS_INVALID_PARAMETER;
 311                 }
 312         }
 313
 314         talloc_steal(state, state->encrypted_session_key.data);
 315
 316         if (auth_flags)
 317                 ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
 318
 319         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, domain))) {
 320                 return nt_status;
 321         }
 322
 323         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, user))) {
 324                 return nt_status;
 325         }
 326
 327         if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_workstation(ntlmssp_state, workstation))) {
 328                 return nt_status;
 329         }
 330
 331         DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
 332                  ntlmssp_state->user, ntlmssp_state->domain, ntlmssp_state->workstation, (unsigned long)ntlmssp_state->lm_resp.length, (unsigned long)ntlmssp_state->nt_resp.length));
 333
 334 #if 0
 335         file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
 336         file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
 337 #endif
 338
 339         /* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
 340            client challenge
 341
 342            However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
 343         */
 344         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 345                 if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
 346                         struct MD5Context md5_session_nonce_ctx;
 347                         SMB_ASSERT(ntlmssp_state->internal_chal.data
 348                                    && ntlmssp_state->internal_chal.length == 8);
 349
 350                         ntlmssp_state->doing_ntlm2 = true;
 351
 352                         memcpy(ntlmssp_state->crypt.ntlm2.session_nonce, ntlmssp_state->internal_chal.data, 8);
 353                         memcpy(&ntlmssp_state->crypt.ntlm2.session_nonce[8], ntlmssp_state->lm_resp.data, 8);
 354
 355                         MD5Init(&md5_session_nonce_ctx);
 356                         MD5Update(&md5_session_nonce_ctx, ntlmssp_state->crypt.ntlm2.session_nonce, 16);
 357                         MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
 358
 359                         ntlmssp_state->chal = data_blob_talloc(ntlmssp_state,
 360                                                                session_nonce_hash, 8);
 361
 362                         /* LM response is no longer useful, zero it out */
 363                         data_blob_free(&ntlmssp_state->lm_resp);
 364
 365                         /* We changed the effective challenge - set it */
 366                         if (!NT_STATUS_IS_OK(nt_status =
 367                                              ntlmssp_state->set_challenge(ntlmssp_state,
 368                                                                                  &ntlmssp_state->chal))) {
 369                                 return nt_status;
 370                         }
 371
 372                         /* LM Key is incompatible... */
 373                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 374                 }
 375         }
 376         return NT_STATUS_OK;
 377 }
 378
 379 /**
 380  * Next state function for the Authenticate packet
 381  * (after authentication - figures out the session keys etc)
 382  *
 383  * @param ntlmssp_state NTLMSSP State
 384  * @return Errors or NT_STATUS_OK.
 385  */
 386
 387 static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
 388                                         struct ntlmssp_server_auth_state *state)
 389 {
 390         struct gensec_ntlmssp_context *gensec_ntlmssp =
 391                 talloc_get_type_abort(gensec_security->private_data,
 392                                       struct gensec_ntlmssp_context);
 393         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 394         DATA_BLOB *user_session_key = &state->user_session_key;
 395         DATA_BLOB *lm_session_key = &state->lm_session_key;
 396         NTSTATUS nt_status;
 397         DATA_BLOB session_key = data_blob(NULL, 0);
 398
 399         if (!(gensec_security->want_features
 400               & (GENSEC_FEATURE_SIGN|GENSEC_FEATURE_SEAL|GENSEC_FEATURE_SESSION_KEY))) {
 401                 return NT_STATUS_OK;
 402         }
 403
 404         if (user_session_key)
 405                 dump_data_pw("USER session key:\n", user_session_key->data, user_session_key->length);
 406
 407         if (lm_session_key)
 408                 dump_data_pw("LM first-8:\n", lm_session_key->data, lm_session_key->length);
 409
 410         /* Handle the different session key derivation for NTLM2 */
 411         if (ntlmssp_state->doing_ntlm2) {
 412                 if (user_session_key && user_session_key->data && user_session_key->length == 16) {
 413                         session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 414                         hmac_md5(user_session_key->data, ntlmssp_state->crypt.ntlm2.session_nonce,
 415                                  sizeof(ntlmssp_state->crypt.ntlm2.session_nonce), session_key.data);
 416                         DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
 417                         dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
 418
 419                 } else {
 420                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
 421                         session_key = data_blob(NULL, 0);
 422                 }
 423         } else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
 424                 /* Ensure we can never get here on NTLMv2 */
 425                 && (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
 426
 427                 if (lm_session_key && lm_session_key->data && lm_session_key->length >= 8) {
 428                         if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
 429                                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 430                                 SMBsesskeygen_lm_sess_key(lm_session_key->data, ntlmssp_state->lm_resp.data,
 431                                                           session_key.data);
 432                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 433                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 434                         } else {
 435
 436                                 /* When there is no LM response, just use zeros */
 437                                 static const uint8_t zeros[24];
 438                                 session_key = data_blob_talloc(ntlmssp_state, NULL, 16);
 439                                 SMBsesskeygen_lm_sess_key(zeros, zeros,
 440                                                           session_key.data);
 441                                 DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
 442                                 dump_data_pw("LM session key:\n", session_key.data, session_key.length);
 443                         }
 444                 } else {
 445                         /* LM Key not selected */
 446                         ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 447
 448                         DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
 449                         session_key = data_blob(NULL, 0);
 450                 }
 451
 452         } else if (user_session_key && user_session_key->data) {
 453                 session_key = data_blob_talloc(ntlmssp_state, user_session_key->data, user_session_key->length);
 454                 DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
 455                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 456
 457                 /* LM Key not selected */
 458                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 459
 460         } else if (lm_session_key && lm_session_key->data) {
 461                 /* Very weird to have LM key, but no user session key, but anyway.. */
 462                 session_key = data_blob_talloc(ntlmssp_state, lm_session_key->data, lm_session_key->length);
 463                 DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
 464                 dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
 465
 466                 /* LM Key not selected */
 467                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 468
 469         } else {
 470                 DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
 471                 session_key = data_blob(NULL, 0);
 472
 473                 /* LM Key not selected */
 474                 ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
 475         }
 476
 477         /* With KEY_EXCH, the client supplies the proposed session key,
 478            but encrypts it with the long-term key */
 479         if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
 480                 if (!state->encrypted_session_key.data
 481                     || state->encrypted_session_key.length != 16) {
 482                         data_blob_free(&state->encrypted_session_key);
 483                         DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
 484                                   (unsigned)state->encrypted_session_key.length));
 485                         return NT_STATUS_INVALID_PARAMETER;
 486                 } else if (!session_key.data || session_key.length != 16) {
 487                         DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
 488                                   (unsigned)session_key.length));
 489                         ntlmssp_state->session_key = session_key;
 490                 } else {
 491                         dump_data_pw("KEY_EXCH session key (enc):\n",
 492                                      state->encrypted_session_key.data,
 493                                      state->encrypted_session_key.length);
 494                         arcfour_crypt(state->encrypted_session_key.data,
 495                                       session_key.data,
 496                                       state->encrypted_session_key.length);
 497                         ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
 498                                                                       state->encrypted_session_key.data,
 499                                                                       state->encrypted_session_key.length);
 500                         dump_data_pw("KEY_EXCH session key:\n",
 501                                      state->encrypted_session_key.data,
 502                                      state->encrypted_session_key.length);
 503                         talloc_free(session_key.data);
 504                 }
 505         } else {
 506                 ntlmssp_state->session_key = session_key;
 507         }
 508
 509         if ((gensec_security->want_features & GENSEC_FEATURE_SIGN)
 510             || (gensec_security->want_features & GENSEC_FEATURE_SEAL)) {
 511                 nt_status = ntlmssp_sign_init(ntlmssp_state);
 512         } else {
 513                 nt_status = NT_STATUS_OK;
 514         }
 515
 516         ntlmssp_state->expected_state = NTLMSSP_DONE;
 517
 518         return nt_status;
 519 }
 520
 521
 522 /**
 523  * Next state function for the Authenticate packet
 524  *
 525  * @param gensec_security GENSEC state
 526  * @param out_mem_ctx Memory context for *out
 527  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
 528  * @param out The reply, as an allocated DATA_BLOB, caller to free.
 529  * @return Errors or NT_STATUS_OK if authentication sucessful
 530  */
 531
 532 NTSTATUS ntlmssp_server_auth(struct gensec_security *gensec_security,
 533                              TALLOC_CTX *out_mem_ctx,
 534                              const DATA_BLOB in, DATA_BLOB *out)
 535 {
 536         struct gensec_ntlmssp_context *gensec_ntlmssp =
 537                 talloc_get_type_abort(gensec_security->private_data,
 538                                       struct gensec_ntlmssp_context);
 539         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 540         struct ntlmssp_server_auth_state *state;
 541         NTSTATUS nt_status;
 542
 543         /* zero the outbound NTLMSSP packet */
 544         *out = data_blob_null;
 545
 546         state = talloc_zero(ntlmssp_state, struct ntlmssp_server_auth_state);
 547         if (state == NULL) {
 548                 return NT_STATUS_NO_MEMORY;
 549         }
 550
 551         nt_status = ntlmssp_server_preauth(ntlmssp_state, state, in);
 552         if (!NT_STATUS_IS_OK(nt_status)) {
 553                 TALLOC_FREE(state);
 554                 return nt_status;
 555         }
 556
 557         /*
 558          * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
 559          * is required (by "ntlm auth = no" and "lm auth = no" being set in the
 560          * smb.conf file) and no NTLMv2 response was sent then the password check
 561          * will fail here. JRA.
 562          */
 563
 564         /* Finally, actually ask if the password is OK */
 565         nt_status = ntlmssp_state->check_password(ntlmssp_state,
 566                                                   &state->user_session_key,
 567                                                   &state->lm_session_key);
 568         if (!NT_STATUS_IS_OK(nt_status)) {
 569                 TALLOC_FREE(state);
 570                 return nt_status;
 571         }
 572
 573         nt_status = ntlmssp_server_postauth(gensec_security, state);
 574         if (!NT_STATUS_IS_OK(nt_status)) {
 575                 TALLOC_FREE(state);
 576                 return nt_status;
 577         }
 578
 579         TALLOC_FREE(state);
 580         return NT_STATUS_OK;
 581 }
 582
 583 /**
 584  * Return the challenge as determined by the authentication subsystem
 585  * @return an 8 byte random challenge
 586  */
 587
 588 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
 589                                            uint8_t chal[8])
 590 {
 591         struct gensec_ntlmssp_context *gensec_ntlmssp =
 592                 talloc_get_type_abort(ntlmssp_state->callback_private,
 593                                       struct gensec_ntlmssp_context);
 594         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 595         NTSTATUS status;
 596
 597         status = auth_context->get_challenge(auth_context, chal);
 598         if (!NT_STATUS_IS_OK(status)) {
 599                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
 600                         nt_errstr(status)));
 601                 return status;
 602         }
 603
 604         return NT_STATUS_OK;
 605 }
 606
 607 /**
 608  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 609  *
 610  * @return If the effective challenge used by the auth subsystem may be modified
 611  */
 612 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 613 {
 614         struct gensec_ntlmssp_context *gensec_ntlmssp =
 615                 talloc_get_type_abort(ntlmssp_state->callback_private,
 616                                       struct gensec_ntlmssp_context);
 617         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 618
 619         return auth_context->challenge_may_be_modified(auth_context);
 620 }
 621
 622 /**
 623  * NTLM2 authentication modifies the effective challenge,
 624  * @param challenge The new challenge value
 625  */
 626 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 627 {
 628         struct gensec_ntlmssp_context *gensec_ntlmssp =
 629                 talloc_get_type_abort(ntlmssp_state->callback_private,
 630                                       struct gensec_ntlmssp_context);
 631         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 632         NTSTATUS nt_status;
 633         const uint8_t *chal;
 634
 635         if (challenge->length != 8) {
 636                 return NT_STATUS_INVALID_PARAMETER;
 637         }
 638
 639         chal = challenge->data;
 640
 641         nt_status = auth_context->set_challenge(auth_context,
 642                                                 chal,
 643                                                 "NTLMSSP callback (NTLM2)");
 644
 645         return nt_status;
 646 }
 647
 648 /**
 649  * Check the password on an NTLMSSP login.
 650  *
 651  * Return the session keys used on the connection.
 652  */
 653
 654 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
 655                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 656 {
 657         struct gensec_ntlmssp_context *gensec_ntlmssp =
 658                 talloc_get_type_abort(ntlmssp_state->callback_private,
 659                                       struct gensec_ntlmssp_context);
 660         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 661         NTSTATUS nt_status;
 662         struct auth_usersupplied_info *user_info;
 663
 664         user_info = talloc(ntlmssp_state, struct auth_usersupplied_info);
 665         if (!user_info) {
 666                 return NT_STATUS_NO_MEMORY;
 667         }
 668
 669         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 670         user_info->flags = 0;
 671         user_info->mapped_state = false;
 672         user_info->client.account_name = ntlmssp_state->user;
 673         user_info->client.domain_name = ntlmssp_state->domain;
 674         user_info->workstation_name = ntlmssp_state->workstation;
 675         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 676
 677         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 678         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 679         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 680         user_info->password.response.nt = ntlmssp_state->nt_resp;
 681         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 682
 683         nt_status = auth_context->check_password(auth_context,
 684                                                  gensec_ntlmssp,
 685                                                  user_info,
 686                                                  &gensec_ntlmssp->server_info);
 687         talloc_free(user_info);
 688         NT_STATUS_NOT_OK_RETURN(nt_status);
 689
 690         if (gensec_ntlmssp->server_info->user_session_key.length) {
 691                 DEBUG(10, ("Got NT session key of length %u\n",
 692                            (unsigned)gensec_ntlmssp->server_info->user_session_key.length));
 693                 *user_session_key = gensec_ntlmssp->server_info->user_session_key;
 694         }
 695         if (gensec_ntlmssp->server_info->lm_session_key.length) {
 696                 DEBUG(10, ("Got LM session key of length %u\n",
 697                            (unsigned)gensec_ntlmssp->server_info->lm_session_key.length));
 698                 *lm_session_key = gensec_ntlmssp->server_info->lm_session_key;
 699         }
 700         return nt_status;
 701 }
 702
 703 /**
 704  * Return the credentials of a logged on user, including session keys
 705  * etc.
 706  *
 707  * Only valid after a successful authentication
 708  *
 709  * May only be called once per authentication.
 710  *
 711  */
 712
 713 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 714                                      struct auth_session_info **session_info)
 715 {
 716         NTSTATUS nt_status;
 717         struct gensec_ntlmssp_context *gensec_ntlmssp =
 718                 talloc_get_type_abort(gensec_security->private_data,
 719                                       struct gensec_ntlmssp_context);
 720         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 721
 722         nt_status = auth_generate_session_info(ntlmssp_state,
 723                                                gensec_security->event_ctx,
 724                                                gensec_security->settings->lp_ctx,
 725                                                gensec_ntlmssp->server_info,
 726                                                session_info);
 727         NT_STATUS_NOT_OK_RETURN(nt_status);
 728
 729         (*session_info)->session_key = data_blob_talloc(*session_info,
 730                                                         ntlmssp_state->session_key.data,
 731                                                         ntlmssp_state->session_key.length);
 732
 733         return NT_STATUS_OK;
 734 }
 735
 736 /**
 737  * Start NTLMSSP on the server side
 738  *
 739  */
 740 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 741 {
 742         NTSTATUS nt_status;
 743         struct ntlmssp_state *ntlmssp_state;
 744         struct gensec_ntlmssp_context *gensec_ntlmssp;
 745
 746         nt_status = gensec_ntlmssp_start(gensec_security);
 747         NT_STATUS_NOT_OK_RETURN(nt_status);
 748
 749         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 750                                                struct gensec_ntlmssp_context);
 751         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 752
 753         ntlmssp_state->role = NTLMSSP_SERVER;
 754
 755         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 756
 757         ntlmssp_state->allow_lm_key = (lp_lanman_auth(gensec_security->settings->lp_ctx)
 758                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 759
 760         ntlmssp_state->neg_flags =
 761                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 762
 763         ntlmssp_state->lm_resp = data_blob(NULL, 0);
 764         ntlmssp_state->nt_resp = data_blob(NULL, 0);
 765
 766         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 767                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 768         }
 769
 770         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 771                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 772         }
 773
 774         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 775                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 776         }
 777
 778         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 779                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 780         }
 781
 782         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 783                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 784         }
 785
 786         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 787                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 788         }
 789         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 790                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 791         }
 792
 793         gensec_ntlmssp->auth_context = gensec_security->auth_context;
 794
 795         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 796         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 797         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 798         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 799         if (lp_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 800                 ntlmssp_state->server.is_standalone = true;
 801         } else {
 802                 ntlmssp_state->server.is_standalone = false;
 803         }
 804
 805         ntlmssp_state->server.netbios_name = lp_netbios_name(gensec_security->settings->lp_ctx);
 806
 807         ntlmssp_state->server.netbios_domain = lp_workgroup(gensec_security->settings->lp_ctx);
 808
 809         {
 810                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 811
 812                 /* Find out the DNS domain name */
 813                 dnsdomname[0] = '\0';
 814                 safe_strcpy(dnsdomname, lp_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
 815
 816                 /* Find out the DNS host name */
 817                 safe_strcpy(dnsname, ntlmssp_state->server.netbios_name, sizeof(dnsname) - 1);
 818                 if (dnsdomname[0] != '\0') {
 819                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 820                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 821                 }
 822                 strlower_m(dnsname);
 823
 824                 ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state,
 825                                                                       dnsname);
 826                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 827
 828                 ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state,
 829                                                                         dnsdomname);
 830                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 831         }
 832
 833         return NT_STATUS_OK;
 834 }
 835